for 1080p you do not need an sli setup, get a gtx 570 or hd 6970, quadfire is an absolute horrible idea, anyone who rec this obviously doesn't have a clue, drivers for 2 gpus are bad enough you think 4 will run smoothly!?, I think not, really crossfire or sli should only be used for high resolutions or multi monitor setups imo otherwise there are plenty powerful single card solutions that will get the job done as the ones I listed above. In my experiences crossfire drivers are extremely weak, had crossfire 6870s and went to a single card because of the piss poor minimum fps and general headaches that were consistent across several drivers, this is my 2 cents, good luck